Question 1

Which of the following best describes the difference between an ionic and a covalent bond?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between two nonmetals.

Question 2

What is the correct formula unit for the ionic compound formed between magnesium (Mg) and phosphate (PO$$_4$$^{3-}$$)?

Accepted Answer

$$\mathrm{Mg_3$(PO_4$)_2}$$

Question 3

Which of the following compounds is most likely to conduct electricity when dissolved in water?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 4

Which of the following is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 5

What is the correct Lewis dot structure for ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

N with three single bonds to H and one lone pair on N

Question 6

Which of the following elements exists naturally as a diatomic molecule?

Accepted Answer

Oxygen

Question 7

A compound is formed between calcium (Ca$$^{2+}) $$and nitrate (NO$$_3^-). $$What is its correct chemical formula?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 8

Which of the following is NOT a correct statement about covalent compounds?

Accepted Answer

They conduct electricity when dissolved in water.

Question 9

What is the correct name for the compound $$\mathrm{CO_2$}$$?

Accepted Answer

Carbon dioxide

Question 10

Which of the following is the correct formula for the ionic compound formed between aluminum (Al$$^{3+}) $$and sulfate (SO$$_4$$^{2-}$$)?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 11

Which of the following is a correct application of the octet rule?

Accepted Answer

Oxygen forms two bonds to achieve a total of eight valence electrons.

Question 12

What is the correct formula for the compound formed between potassium (K$$^+) $$and phosphate (PO$$_4$$^{3-}$$)?

Accepted Answer

$$\mathrm{K_3PO_4}$$

Question 13

Which of the following is the correct Lewis dot structure for water ($$\mathrm{H_2O}$$)?

Accepted Answer

O with two single bonds to H and two lone pairs on O

Question 14

Which of the following consumer products contains a compound with the formula ZnO?

Accepted Answer

Sunscreen

Question 15

Which of the following is the correct name for the compound $$\mathrm{$$NCl_3$$}$$?

Accepted Answer

Nitrogen trichloride

Question 16

What is the correct formula for the ionic compound formed between barium (Ba$$^{2+}) $$and nitrate (NO$$_3^-$$)?

Accepted Answer

$$\mathrm{Ba(NO_3$)_2}$$

Question 17

Which of the following is a correct statement about the formation of ionic compounds?

Accepted Answer

The total positive charge must equal the total negative charge in the formula unit.

Question 18

Which of the following is the correct name for the polyatomic ion $$\mathrm{$$HCO_3$$^-}$$?

Accepted Answer

Hydrogen carbonate

Question 19

Which of the following is a correct Lewis dot structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

C with two double bonds to two O atoms, each O with two lone pairs

Question 20

Which of the following is the correct formula for the compound formed between lithium (Li$$^+) $$and oxide (O$$^{2-}$$)?

Accepted Answer

$$\mathrm{Li_2O}$$

Ionic and Covalent Compounds: Structure, Naming, and Lewis Dot Representations

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